This book is useable on my desktop, but the mobile app is telling me I must purchase to access. (I pre-paid for this the first day it was available on DNDB.)

There is an issue with adding equipment from the reveler background, I think it adds the equipment just fine but it looks like this when you select it:

https://drive.google.com/file/d/1Y4H6EF6A0YN2lDJc3FLfOO-hpfhnisv5/view?usp=drivesdk

Found bugs:

Crimson Ritualist background causes 2 occurrences of the blood bolt cantrip. Neither of them have a to-hit modifier that populates.
Dark Bargains are not available in optional features for any of the 2014 classes.

Is there any ETA on updating everything to have markable slots for use of abilities, etc? 

For the Grim Harbinger the grim stat block does not show up on the character sheet and creator. It also does not have its stats shown on the character sheet like the beast master companions would have.

After selecting the Experimental Feat I chose natural armor which should make my natural AC 13. This did not happen...

Avantris Entertainment spells are not showing their Hit/DC on spell lists (2014 edition characters).

https://drive.google.com/file/d/1ZFzyVs8tN2V2xr_P8GaUICNhsMFGb-Jm/view?usp=sharing

There are a couple of pieces of art not attributed properly.

I don't know if it's the page being cut off weirdly by my browser, or a formatting issue on your end, but it's a problem.

One is on the Species section, & one is on the Subclasses section.

The Sinner Rouge has a few bugs. (both 2014 and 2024)

• It isn't proficient with its own Jinx Weapon. 
• Despite it stating that you can change your Jinx Weapon through a ritual, it doesn't allow you to change it, so it remains stuck as a game set.
• It says your Jinx Weapon can take the form of a Pistol using the Pistol stats, but the class doesn't give you proficiency with Firearms. 

In addition, it also only uses a d8 on the character sheet, despite the book’s text says it’s the same as a pistol which is a d10. 

The Sinner’s Jinx Weapon I mean.

looks like the book has changed to say d8 instead of using same stats as pistol ?

The Night Vision option of the Altered feat is granting a bonus of 60 feet to characters who already have Darkvision, instead of the listed 30 feet.

The Path of the Experiment's Volatile Serum feature doesn't give the Serum options when attempting to choose an option. When I click the dropdown, the only option available is the text that says "Choose a Level 3 Option".

I dont know if its just more, but i found that the dark bargains dont work for monks. ive swapped multiple classes and they work just fine. switched back to monk and the option to choose the dark bargain isnt there anymore

Comparing the official PDF versions to the DnD beyond version… It seems as if they sort of combined the 2014 PDF and 2024 PDF…. weirdly though… the app shows the version that matches the 2024 PDF. 

App:

Jinx Weapon. As a 1-hour ritual using a Gaming Set, you magically create a jinx weapon that channels your Jinxcraft. This weapon takes the form of a Pistol or a Gaming Set (which uses Pistol game statistics). For you, the jinx weapon ignores the Loading property and creates its own ammunition that deals Force damage.

Website:

Jinx Weapon. As a 1-hour ritual using a Gaming Set, you magically create a jinx weapon that channels your Jinxcraft. This weapon takes the form of a Pistol or a Gaming Set. For you, the Gaming Set jinx weapon is a Simple Ranged weapon with a normal range of 30 feet and a long range of 90 feet, it deals 1d8 Force damage on a hit, and has the Vex mastery property.

2014 PDF:

Jinx Weapon. As a 1-hour ritual using a gaming set, you magically create a jinx weapon that channels your Jinxcraft. This weapon takes the form of a pistol or a gaming set. For you, the jinx weapon is a simple ranged weapon with a normal range of 30 feet and a long range of 90 feet, and it deals 1d8 force damage on a hit.

2024 PDF:

Jinx Weapon. As a 1-hour ritual using a Gaming Set, you magically create a jinx weapon that channels your Jinxcraft. This weapon takes the form of a Pistol or a Gaming Set (which uses Pistol game statistics). For you, the jinx weapon ignores the Loading property and creates its own ammunition that deals Force damage. 

Noticed a lot of errors or poorly written text that could use with some correcting. Here's a list I found from just the feats and species.

Feats

• Cult Initiate: Doesn't let you cast the spell once per short rest for free as you are supposed to be able to. It also includes scaled versions for higher levels which I am not sure is intended. It also lets you choose 2 spells although the feat description only says you can do one. Also, one of the spells (and only one) says, when you click on the description, that you can cast it using a higher spell slot in all red text. As other spells don't provide the specific description, I am unsure why it is there.
• Altered: Just plain broken. Aquatic speed is not registered. Neither version of Natural Armor actually update your armor. Natural Weapons doesn't add your proficiency bonus. Nightvision increases your darkvision range by 60 feet instead of 30 if you have darkvision already. I've never before seen a paid piece of D&D Beyond content where not a single facet of it worked as intended, and I find myself extremely disappointed.
• Charmed Twister: Interestingly, snippet text doesn't rely on you choosing between Int, Wis, Cha, instead simply reflecting whichever value is highest. This isn't a huge deal as it would be a silly idea to deliberately choose a lower valued attribute for said feat, but it makes me wonder why a choice was even needed to be made in the first place, especially since they had to retype the text for each choice anyways.
• Crimson Ritualist: Not a bug, just poorly written. Character sheet says "Expend a number of HP Dice up to your Proficiency Bonus" then states how many that is. It would be much clearer if they simply said "Expend {{proficiency}} HP Dice". There is also no action associated with this, which is a little odd as it is a 'once per long rest' feature and specifies a bonus action is required to drink.
• Death Defier: Does not add your Constitution score to death saving throws.
• Fate Gambler: The 'Win Big' portion of the feat does not calculate the temp HP equal to your character level.
• Ghostlight Medium: Does not have any text in the feature tab. The action for using this feat is not limited by uses to short/long rest despite text saying it should be.
• Grave Keeper: 'Divine Channel' ability has a save DC set WAY too high. With a level 5 character with 18 wisdom I am listed as having a save DC of 26. I think they added the Wisdom SCORE to the save DC value instead of the Wisdom MODIFIER.
• Swift Witchcraft: Action for 'Swift Invocation' ability has no text, just a 'long rest' checkbox.

Species

• Deepborn: 'Endless Hunger' does not include how you don't have disadvantage against targets in the snippet. You have to click the ability to get the full description. As this is likely the primary reason you would use the ability this seems pretty important. Also, the ability 'Eldritch Gibbering' is showing up as an Attack action, despite being a saving throw ability. Even listed as an attack it is not calculated properly, as it does not include proficiency bonuses.
• Bogborn: 'Guiding Bond' does not have limited uses per long rest as intended.
• Curseborn: 'Cursed Claws' ability does not have a corresponding action for it on the actions tab. There is also no choice to select between Strength and Dexterity. Also, 'Grey Balance' ability does not specify on the character sheet text that you then suffer disadvantage on your next save despite the information page specifying that.
• Gnarlborn: For some reason, the 'Elderwoods Whispers' feature causes the tool proficiency box on your character sheet to say: "(You gain proficiency with a skill, a tool, or learn one language of your choice until you next finish a Long Rest.)" instead of just listing what it is that you have.  Also, 'Grasping Branches' is listed as an attack action despite being a DC save ability, and does not state the save DC in the snippet text, simply implying that it restrains enemies without fail.
• Graveborn: 'Infused Drakkonite' has a cooldown checkbox listed as 'long rest' despite the text saying 'short/long rest'. There is also no 'Devour Corpse' action listed, which there probably should be, and the feature should specify that you gain back 'a number of hit points equal to the value rolled {{modifier:con}}' or something to that effect (more of a suggestion, not the biggest issue here but feels so out of place to see in a piece of snippet text).
• Harvestborn: Not a huge deal, but the species says you select which attribute you use for the Dancing Lights cantrip, but never asks you to select one. I don't think the cantrip requires a saving throw, but it's odd to see.
• Plagueborn: Action 'Plague Bearer,' they already have the DC calculated on the character sheet, so I'm not sure why they then go on to explain how to calculate the value.
• Relicborn: Not a bug but rather an exclamation of disbelief: 'Dance of Death' feature feels like it could be easily broken as it has no cooldown. This effectively replaces the rogue's 'Steady Aim' feature, giving them advantage while also being able to move and has a chance at temp hp, not to mention that any class can take it as well! Was this supposed to be a limited use ability but someone just forgot when adding it?
• Silkborn: "Bejeweled Carapace" does not calculate the value for you in either the feature or action tab of character sheet.
• Stoneborn: Just a typo, but 'Path's Grace' needs a space between 'no' and 'material'. Not a huge deal, but once I noticed it my OCD wouldn't let it go...

I'll take a look at subclasses at some point, but I'm exhausted going through all this at the moment!

An issue ive found is that for example the oath of castigation paladin, you get certain spells always prepared at different levels, but they do not appear in the spell list on the character sheet when at the appropriate level

Is everyone checking both the 2014 and 2024 versions of these, out of curiosity?

Might be something to double & triple-check with bug hunting.

so the big thing that I found that Hex Slinger for sinner rogue dose not have it limited use for both 2014 and 2024.

For the Horned King Patron you have the "Malediction" ability which allows you to curse an enemy, but for some reason it shows up in your own saving throws.