And Shine Heaven Now has remained pretty much consistent since it started seven years ago (started five days a week, later expanded to six), delays only happening when the host site, Comic Genesis, goes crack. Which got pointed out by Jon Stewarthere.
Angband Tales From The Pit started with the plan to update three days a week. During its five-year run, the only deviation from that came when the author decided his Strip Buffer was too big; for the next year or so, it updated five days a week instead.
Arthur, King of Time and Space has updated seven days a week, without missing a strip, since May 21st, 2004. There are trade-offs involved; the art style varieswildly depending on how much the deadline is looming when the artist starts work. The content varies too, but there's always something up.
HC Bailly updates every day, taking a day off on occasion (Usually after episode 50 or a massive turn in plot, whichever comes first), but even then he at least updates his side LP. However, the slip is played straight during his LP of Final Fantasy XII, due to the difficulty of finding the Rare Games.
For the last three years Better Days has only ever missed one of the Monday/Friday updates due to a server crash, probably due to its own buffer. It also possibly has to do with the fact that most of the pornographic art folios that the writer sells are based on the Better Days universe, thus making it more lucrative to keep regular.
In its entire seven-plus year run (a little more than 2500 days) of daily strips, Bob and George had only had two real scheduling lapses. One was when David Anez announced a hiatus to relaunch the comic early in its run, which lasted only nineteen days. The other was a gag where the comic was intentionally not updated for one day, and the characters immediately complained about it in the next strip. Any other schedule slips (usually caused by server issues), would result in a double update next time, meaning you still got a total of seven strips out of a week. And with the server problems he constantly had over the years, Dave sometimes had to do those triple updates just so that he could make up for a meltdown.
Brawl in the Family tended to avoid this for the most part, too. Creator Matthew Taranto often slows down during holidays, but only because he likes to make enormous elaborate comics that have musical accompaniment. Leading up to Christmas 2010, he produced three. Despite this, the comic did go on hiatus a month and a half when Matthew got Crohn's Disease, which was a very scary period. Luckily, he survived, and the next hiatus was only for a few weeks as he got married. He stayed on schedule until the 600th and final strip.
Chuggaaconroy's Let's Plays avoid Schedule Slip very well, updating once every day consistently. When he does fall behind, he always says so in the videos before he takes a break, but other than the occasional unforeseen problem, breaks between LPs, and his temporary YouTube ban in July 2010, he never misses a day.
Happens some in Collar 6, but not to a ridiculous extent. Since the comic began, every month has had between 7 and 16 strips, averaging about 10.
Commissioned started with a three-times-a-week schedule, but slowly evolved to the now strip-per-day schedule. With art evolution. And multiple storylines.
Say what you want about Ctrl+Alt+Del, it hasn't missed an update in years. That said, Chef Brian was invented entirely due to an almost-schedule-slip.
Cinema Bums updates regularly without fail, but benefits from a slightly less taxing Monday/Thursday schedule.
The Daily Grind Iron Man Challenge is an ongoing contest to see whose webcomic can go the longest without missing an update (required updates are Mondays through Fridays). Out of 56 original contestants on February 28, 2005, four are left. (Arthur, King of Time and Space was eliminated in June 2008, but not for missing an update; it was for having two single-panel strips too close together.)
Darths & Droids stays on schedule no matter what. Probably because the author set things up so it auto-updates and just takes the appropriate comic from the buffer. Hence, he could (and did) go on vacation for a few weeks and not have any problems.
The Descendants started with a schedule listed as "whenever the hell I feel like it", which included anything from two pages a week to two five-page chapters in a week. It later changed to "Weekly" before the site was redesigned with a rather groveling newspost from the author saying the fans "deserved better". Since then, the site gone through two years with a banner proclaiming "Updated Mondays with at least 5 pages" and has stuck to it.
Dominic Deegan keeps a rigorous seven-days-a-week schedule, even after switching from four panels to eight at one point and introducing colored Sunday strips. That said, the only time this is broken is when creator Mookie announces his plans to attend an anime convention or two. And even then, he announces his plans - and any alterations to his updating schedule - several weeks in advance. With the start of 2009, Mookie has adopted a Monday-through-Friday schedule instead, likewise kept updated on time.
Double-U Tea F used to be updated sporadically, as in "once a month if you're lucky" sporadically. That changed at the beginning of 2010, as the comic has stuck to a consistent Tuesday/Thursday/Saturday update schedule, without a slip, ever since. The author's other comic, Inner Fire, was created during this time, and has never missed its scheduled update on Friday.
The original run of Dragon Tails had 2000 consecutive daily comics before the author ended the strip. Perhaps ironic, given that since its reboot, it has suffered a great deal from this trope.
Drowtales has kept on schedule in airing formerly seven pages a week and now six pages a week (to give the artists a break and time to work on side projects) since the reorganising, and has missed on this schedule EXACTLY once, when the artists left home before posting the strip. The strip in question was up by the end of the day.
Both of Sarah Ellerton's narrative comics, Inverloch and The Phoenix Requiem, have been known for updating consistently to completion on the days promised. The author keeps a steady buffer of strips to ensure that real life never intrudes on her update schedule. Inverloch ran from 2003 to 2007, and The Phoenix Requiem began in 2007 a few months after the end of Inverloch and completed in 2011. The author's next project isn't yet known, though in the middle of The Phoenix Requiem, she also worked as the artist on Bobby Crosby's Dreamless.
Ryan Smith successfully completed the entire nine-year run of Funny Farm (another Daily Grind contender), taking the story from gag-based beginnings to densely-plotted conclusion while keeping to the published M-F or 7-day schedule throughout.
Since they started, the Game Grumps have made it a policy to publish at least one new video every day, whether it be a new episode of Game Grumps, or one of their spinoff shows like Steam Train or Table Flip. Thus far, they've only had one day with no updates (August 14th, 2014), and that was because YouTube was having problems with its upload system. But, they still apologized like crazy for missing a day all the same.
Girl Genius updates precisely at midnight, three days a week, without fail. The art doesn't seem to suffer much for it, either. It probably helps that the Foglios had been professional artists for 20 years before taking their comic to the web. No, seriously - WITHOUT FAIL. Their colourist had a freaking heart attack, and the only noticeable change was that the comic was in grayscale until he was better. Then he went back to colour what he missed, without missing a beat on the new material, either. But in 2013, delays started creeping in when Kickstarter-related obligations took over, but what's still impressive is that updates would still occur by the end of the day.
Tom Siddell built up a three-month Strip Buffer prior to launching Gunnerkrigg Court and has maintained it to this day. Even after switching from a twice-a-week schedule to a three-times-a-week schedule (in early 2007), the comic still hasn't missed an update.
TL Welker's Heartcore has maintained a very consistent schedule for as long as it has run, with only very few slips (and plenty of forewarning ahead of those slips).
And let's give a big hand to Bill Holbrook, who currently writes three separate comics (Safe Havens, On The Fast Track, and Kevin & Kell) and has yet to miss an update. The first two are both print comics, complete with editors, which probably help keep him disciplined, but the third was purely on the web when it started in 1995 (but now features in the Atlanta Journal Constitution), and upped from five-a-week to daily around 2000. Needless to say, though, Bill is a professional cartoonist of the first order, and was back when he launched Kevin and Kell.
Jayden and Crusader has updated every Monday at precisely midnight GMT since September 08, and used to update every Monday and Friday since May. One slip up occurred when the artist missed the update by 8 hours in December. This comic suffered a slip of 2 days on 30th of March 09, when a problem with the comic uploader delayed the comic, ruining what was a pretty good run. Most ironic was that this was a comic that the creator had put up in his buffer 3 weeks ago, proving that a strip buffer does not always help
Attempting to avert the Image legacy of Schedule Slip, Robert Kirkman has done his best to keep Invincible on a relatively monthly schedule, usually averaging out to five to six weeks.
The updates to Juathuur went from 5 to 3 a week thanks to every panel now being in color rather than occasional special panels. However, the updates are still very punctual in this regard, and by no means below average by most web comic updates rates.
Last Res0rt, despite having a significantly slower once-a-week schedule to compensate, is notorious for keeping buffers several-months long in order to cover updates during college semesters (when considerably less time can be spent on the comic for obvious reasons). However, it did have one heck of a hiatus / slew of guest strips in early 2010.
Least I Could Do and Looking for Group, made by Ryan Sohmer and Lar deSouza, miss their updates by an hour tops, and if they do, the artist makes a thread on the forums to apologise. They also upped LICD to daily from six times a week. Sohmer seems to think of webcomic-makers without his skill of in-timeness pretty negatively, as seen in the Author Tracthere.
LoadingReadyRun can be counted on to maintain their schedule(s). Since they began in 2003, the number of late updates has been vanishingly small, and not a week has gone by that a video hasn't been posted. In addition, the move to The Escapist means that LRR content is submitted, then posted by the Escapist staff per an actual contract. Add in Unskippable, Feed Dump and checkpoint, and the LRR crew are now - reliably - posting video content as often as many webcomics post cartoons.
Man-Man updated three times a week from 2003 to 2009, and never missed an update.
minus had 130 strips and ran for just about that many weeks.
Misfile keeps true to the "updated every weekday" statement. The only thing that can stop Chris from posting a comic is his wife having a kid.
MS Paint Adventures actually manages to invert this trope: Andrew Hussieonce posted that he would be busy and update less than usual for the next few days. Then he posted eighty new Homestuck pages in the next seven days. At one point he calculated that since he had posted so much material in such a short time that he could take a thirteen year hiatus... and still have one of the highest pages updated/per day ratios of any webcomic. Or to put it another way, he updated so often that if he had spaced out the updates instead of immediately posting them upon completion, he could've posted consistently for over a decade.
Homestuck's updating schedule is weird. Hussie usually updates with one to several pages at least once or twice a day. But nobody knows when, leading to people hovering around the site and others shouting "UPDATE!" on Imageboards. Homestuck fans have become so spoiled by the schedule that Hussie not posting something in a day makes people antsy (or suspect that something is about to happen). By his own standards, he had a heavy schedule slip in spring '11 due to a combination of mild burnout and a series of technical problems and moving, in addition to cons. However, the site still updated more frequently than daily comics. Because of the sheer insanity of Andrew's work schedule, the site has become the largest webcomic in existence despite being only about 3 years old. The end of Act 5 animation's delay played this trope straight, to the point that its release date ended up falling on an Arc Number date a month later than its original projected completion estimate. He explained quite at length why this was so. That delay, and the one following it in anticipation for the launch of Act 6, was pretty much enough to undo the fandom's spoilt approach to updates at least temporarily.
During Act 6 itself, the comic underwent a year-long Gigapause while Hussie worked on other projects and built up a sizeable buffer. As in, he finished almost the entire rest of the comic during that time.
Narbonic. Six days a week, one weekend special, every week, six years, with rare, rare exceptions.
Nukees has held to three updates a week for a decade straight. Looks much the same, though.
Penny Arcade is put out on a schedule. While they used to be very late on it, now they might be a few minutes late, or a few minutes early, and Tycho might not get his newspost up at the same time as the strip, but they will update Mondays, Wednesdays, and Fridays, barring everything except total computer failure while they're away from home (and they still manage to get it up the next day). This is even more remarkable when you consider that, being topical, they can't have a buffer It bears mentioning that when they suffered total computer failure when they were at home, not only did the strip go up on time it made fun of the cartoonists themselves for not keeping backups. Other minor distractions that do not affect the strip's update schedule include the births of their children. They ran a series of guest strips in order to keep up their schedule—because Krahulik caught swine flu and was physically unable to lift a pen. Previously he had also cut open his hand, which resulted in a dark comic assuring people that it wasn't the hand he uses to draw with.
Gina Biggs, author of Red String, deserves mention for having maintained a strict MWF schedule most of the way through 37 chapters (plus two side-stories)... then upped the ante with an update every weekday (plus art/filler on Fridays). As of January 2011, it returned to a MWF schedule (with the Sketch Friday from the daily schedule being retained), due to Gina becoming pregnant.
Regular Show: True to it's name it's stuck to such a rigid schedule that Season 5 followed on almost immediately from Season 4, rather than taking the customary break. On a couple of occasions an episode has been delayed a week but the rest of the season has been weekly as usual.
Rock,, Paper, Cynic, though it sometimes posts later in the day, hasn't missed an update since it started in 2008 (though it's announced a switch from 3 to 5 back to 3 weekly posts).
And where does Sabrina Online fall in all of this? While the output level varies, Eric W. Schwartz has kept to the same published schedule since September 1996: at least one new strip, on the first of each month. Without fail.
Sandra and Woo, since beginning in 2008, has mostly followed its update schedule of a new strip each Monday and Thursday, although there have been some cases of three strips published in the week instead. The comic did took a brief hiatus of a week in 2013 after the publication of the 500th strip.
Schlock Mercenary has had a new strip posted every single day since it started on June 12, 2000, all but one of them being within the first hour or two of the day. The one time it was a few hours late? It was caused by the server farm on which it was hosted exploding, literally, with the author's blog being used to post the new strip while the hosting company was recovering.
SF Debris has a new episode of Star Trek every Saturday, and re-uploads at least one other day a week, along with various other properties on other days. He only misses updates when he takes pre-announced breaks, or when a tornado tears through his front yard and knocks out his power.
Shortpacked! is a weird example. It used to have a regular MWF schedule. Then David Wills started to slip. Soon he started posting every weekday with occasional misses (though he still avoided long gaps between updates). Now, as of April, 2010, he has posted one comic a day Monday-Friday on a perfect schedule since October 2008.
In late 2010 he had a few guest strips fill in for him. Why? First he and his wife were going to visit family for the holidays. Then they were going on the honeymoon they should've gone on 2 years before. His other comic, Dumbing Of Age, had a fairly large buffer, so it kept a normal schedule for the whole time.
And before Shortpacked, he did Roomies! and It's Walky!, with Roomies! starting out in a college paper in 1997. And for a while during Shortpacked!, he did Joyce and Walky! on Tuesday/Thursday for subscribers, and Saturday for free. With rare exceptions, he's been doing at least three strips a week for the last fourteen years.
Without a doubt, Sinfest deserves a spot in the consistency hall of fame. Currently pushing towards an unbelievable milestone of 5000 strips, and updating seven days a week at or not long after midnight without fail. For THIRTEEN YEARS.
Slightly Damned updates once a week. If you do the math, there's actually one point two comics per week since it started in March 2004, the result of several donation drives that were rewarded with extra updates (once the author put up three pages in one day), and otherwise sticking to the schedule: it may be several days late, but bygummit, it's going to get done! And considering the size and quality of the average webcomic strip, that's particularly impressive.
And when there might be a slip, Chu's polite enough to let you know what's up: she announced at the end of July 2009 that the comic will be updated sporadically, if at all, during the month of August due to some life changing events.
Sluggy Freelance has had an update for pretty much every single day since it began in 1997, although cartoonist Pete Abrams did have some help thanks to other cartoonists. Furthermore, while much of its life had updates for 7 days a week, eventually Abrams dropped Saturdays and ran two subsequent series of guest strips. After the second series ended, Saturdays turned into "No content Saturdays", which was actually a series of one-panel gags about the lack of content. Saturdays, and now Sundays as well, finally turned into "fan art" days, dropping the number of actual story days to 5. So basically, something is always updated on the site, but the number of story-related updates has dropped over time. Given that the art has also evolved and improved over the years, and the typical daily product would fill an entire page, the overall content of each update is three times what it was when the comic began in 1997. Even without the weekends, Abrams is producing two to three times the art he was before.
Some of the contributors like Noah Antwiler, The Spoony One, don't have a precise "schedule" per se, but they still post regularly. Despite delaying the sequels to a couple of review series (particularly Final Fantasy VIII and X), put up at least a vlog, review, or something of interest instead. Despite no having an actual schedule he still updates regularly, and he has been doing this continuously for the last couple of years, despite the site crashing in 2009. However, during the last few months when he got sick, there have been a few weeks of understandable schedule slip (one of which concerned him going to a hospital Emergency Room), and he still got on with his vlogs and even apologized for the lack of updates on more than one occasion. However, having a slightly Bipolar Fanbase, you still have people complaining about the lack of updates.
User Friendly has updated daily for ten years straight. He actually calculated how many comics he'd made at that point, too. At one point, the comic went on hiatus due to deaths in the author's family. It still updates daily with a strip from the archive.
xkcd updates every Monday, Wednesday and Friday, usually within seconds (!) of midnight.
Sometimes it updates more often, usually during a story arc (Yes, xkcd does have occasional story arcs)
Yet Another Fantasy Gamer Comic has been running since May 2006 and has only missed one of its daily updates, due to the birth of the author's first child. (He did a double update the next day.)
Zero Punctuation always has a new episode up on Wednesday afternoon (barring holidays, but even then he usually posts a year-in-review clip show to fill the gap).
The Zombie Hunters updates weekly, and has done so for several years. Also includes occasional Thursday updates. While this strip updates slower than the others mentioned here, it is notable in that only Phil Foglio's strip Girl Genius can compare in terms of strip size and quality of artwork- and Foglio himself has over 20 years' experience advantage over the artist of The Zombie Hunters.
Roommates isn't the clockwork precise webcomic most examples here, even if after settling on Mondays (in 2009 or so) slipped less then 5 times. The thing that warrants its inclusion here are the extended periods of time when it gets published more frequently. Current record holder for speed is the 2011 Halloween arc which peaked at 2 pages/day for length "Such Stuff..." 42 pages published Mondays, Wednesdays and Fridays for more than three months.
Minecraft during its alpha and beta days never had a release date posted for the final version until it came pretty close to being a full version, which was released on time. When a new developer took charge of the game, he gave fairly accurate release dates for each new version of Minecraft.
Left 4 Dead 2 was released on the date set by Valve without any delays at all, making it one of the rare moments that Valve Time was not enforced. Of course, the sequel was Valve's way of proving that they could release a regular game on time if they could; if they failed, it would've been pretty embarrassing.