Comparison

RPGViewer vs Nullgen AI Blocker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RPGViewer

This app allows you to play your own RPG Maker and Flash projects directly on your iOS device. It supports various RPG Maker engines and Flash games, offering on-screen controls, gamepad support, and save file management.

Highlights
  • Plays RPG Maker XP, VX, VX Ace, MV, MZ
  • Supports Flash (SWF) games via Ruffle
  • Imports and exports save files
  • On-screen remappable gamepad
  • Real controller support
  • Cheat panel for MV/MZ games
Features
Read full description

RPGViewer is a player for your own RPG Maker and Flash projects, rebuilt from the ground up as a native iOS app. You bring the game. RPGViewer runs it. One app covers the engines you actually have projects in: • RPG Maker XP, VX and VX Ace — run natively through a port of the original RGSS engine, not an imitation of it. Full speed, no browser in the middle. • RPG Maker MV and MZ — full support, including OGG audio with no re-encoding. • Flash (SWF) — played through Ruffle, including Flash games that were never converted to HTML5. • HTML5 games — any self-contained page, opened from your library. Saves work the way you expect • Import existing save files. Drop in a .rpgsave or .rmmzsave from your desktop and it appears in the game's own browser save slots. • Read the game's browser saves directly. Saves the browser version made on the same origin show up here, with title, playtime, location, party and level all decoded. • Export back out. Take a save with you when you move to a new device. • Separate storage per game. Each title keeps its own saves, its own port and its own settings — nothing bleeds across games. Built for playing on a phone • On-screen gamepad with remappable keys. Bind any physical or on-screen control to whatever the game reads. • Real controller support. Connect a gamepad and it takes over, and the on-screen pad steps aside automatically. • One consistent menu. The same control, in the same corner, on every engine — only the rows change, because only the rows that do something are shown. • Fast-forward for native engine games. • Works in landscape and portrait, iPhone and iPad. RPG Maker MV and MZ only • Cheat panel built into the menu — tweak values, items and party members without leaving the game. Please note • RPGViewer is a player only. It contains no games of its own, and it cannot download them. Please make sure the projects you run are obtained through legitimate channels. • It is a generic runtime. It does not modify the source of RPG Maker or Flash projects, and it does not emulate them. • Flash playback is provided by Ruffle. Games that depend on server-side components, or that require a network service, will not run. Built for people making RPG Maker games: test your project on your phone before you ship it, and keep playing the games you already own.

About

Nullgen AI Blocker

This app prevents AI chatbots and websites from functioning on your iPhone or iPad. It blocks access to over 70 AI services, including popular ones like ChatGPT and Gemini, across Safari, Chrome, and other apps. A VPN configuration is used locally on the device to filter AI destinations without routing your traffic.

Highlights
  • Blocks over 70 AI services
  • Works on Safari, Chrome, and apps
  • Local VPN configuration for filtering
  • No off switch for continuous blocking
  • Parental controls for access requests
  • Cross-device protection with Nullgen Pro
Features
Read full description

Nullgen AI Blocker is a parental-control and content-blocking app for families, schools, and workplaces. It stops AI chatbots and AI websites from working on this iPhone or iPad — in Safari, Chrome, and the apps themselves. Set it up once and it stays on. PART OF THE NULLGEN AI BLOCKER SUITE • Browser extension for Chrome, Edge, Firefox, and Safari — detects AI prompt boxes on any website and stops typing and pasting into them, on the device. • iPhone and iPad app (this app) — blocks known AI apps and websites across most websites and apps on the device. • Mac app — the same protection for Safari on the Mac. One Nullgen Pro account covers every device, with the same rules and the same approvals everywhere. WHAT IT BLOCKS ChatGPT, Gemini, Claude, Copilot, Grok, Perplexity, DeepSeek, Character.AI, Poe, Midjourney, and more than 70 other AI services. The list is kept up to date by Nullgen so new tools are covered without an app update. HOW IT WORKS To work, the app asks iOS for permission to add a VPN configuration. That configuration is used only to filter AI destinations on this device. It is not a traditional VPN: your traffic is never routed through Nullgen or anyone else, and nothing you browse is sent to our servers. When an app or browser tries to reach a known AI destination, the request is answered on the device and simply does not load. Everything else works normally. NO OFF SWITCH There is no button in the app to pause or disable blocking. That is the point: the person holding the phone is often not the person who installed it. FREE FOR 3 DAYS Start the trial with no account and no card. It lives on this device. When it ends, protection continues with Nullgen Pro. NULLGEN PRO — FAMILY Subscribe in the app, then link this iPhone or iPad to your Nullgen account at nullgen.ai/link. From there a parent can: • Approve or deny access requests. A child taps “Request AI access”, picks the tool and how long they need it, and the parent approves from the Nullgen dashboard. The tool unblocks instantly for exactly that time — fifteen minutes, an hour, a day, or permanently. • Set allow and deny rules per AI tool for each child. • Cover every device in the household: browser extensions for Chrome, Edge, Firefox, and Safari, plus the iPhone, iPad, and Mac apps, under one subscription. NULLGEN PRO — EDUCATORS AND ENTERPRISE Schools and companies deploy Nullgen across managed devices and route AI access requests to named approvers. Learn more and sign up at nullgen.ai. PRIVACY • Blocking decisions are made on the device. • Nullgen never receives which sites you visit or what you type. • The free trial creates no account. • Access requests contain only the tool, the duration, and an optional note you write. • Nullgen does not sell, share, or disclose any data from this app to third parties, and does not use it for advertising. Privacy Policy: https://nullgen.ai/privacy WHAT IT DOES NOT DO AI features built into services that share ordinary hosts — such as AI answers inside a search engine or a social app — are not blocked separately, because blocking them would block the whole service. On a personal, unsupervised iPhone, iOS still allows the VPN configuration to be removed in Settings; that is an operating-system limit. SUBSCRIPTION TERMS Nullgen Pro Family is offered as a monthly or yearly auto-renewing subscription, billed through your Apple account. Payment is charged at confirmation of purchase. The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel in Settings › Apple Account › Subscriptions. Terms of Service: https://nullgen.ai/terms Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

RPGViewer4 screens
Nullgen AI Blocker4 screens

Verdict

The call

The clearest difference is price: Nullgen AI Blocker at Free against RPGViewer's $4.99. Nullgen AI Blocker also leads on review sentiment (100% vs 56%). RPGViewer's advantage is rating (4.3 vs 3.0) and in-app purchases (none vs 2). On ratings volume, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Nullgen AI Blocker is free to download; RPGViewer costs $4.99 up front. Nullgen AI Blocker sells 2 in-app purchases, starting at $5.99 per month. RPGViewer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RPGViewer holds the better App Store score, 4.3 against 3.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews complicate that: 56% of RPGViewer's written reviews are positive against 100% of Nullgen AI Blocker's, so the app with the better star average is not the one people write more warmly about.

Scorecard6 real differences · 4 level
RPGViewer versus Nullgen AI Blocker: the parameters behind the verdict, then further details
ParameterRPGViewerNullgen AI Blocker
Price$4.99Free — better
Rating4.3 (3 ratings) — better3.0 (2 ratings)
Positive reviews56.1% of reviews100.0% of reviews — better
Number of ratings3 — better2
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better18.0
Further details — not scored
Size63 MB17 MB
Age rating+917+
DeveloperLudan CuiNullgen, Inc.

Customer experience

RPGViewer

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews132 reviews
Positive56.1%
Neutral30.3%
Negative13.6%

Nullgen AI Blocker

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

RPGViewer

Reported bugs

56 issues
  • CG errors
  • Black screen on video playback
  • Button presses also register as touches
  • Black screen after changing positions
  • Movie folder glitches
Show 51 more
  • Save file import/export not working
  • Cannot import/export saves
  • SyntaxError: JSON Parse error: Unrecognized token '<'
  • Games with foreign language filenames fail to run
  • Audio files not playing
  • Mouse issues (holding left button)
  • Virtual pad input lag/ghosting
  • Game crashes randomly
  • Cannot save game
  • Corrupted app requiring re-download
  • Infinite loading screens
  • Loss of progress on re-download
  • Sound disappears after switching apps
  • Virtual mouse not working for some games
  • Touch not working in certain sections
  • Game files disappear after update
  • Games not showing up after re-opening app
  • Error when adding games (folder already exists)
  • Material loss in H5 games
  • iPad cannot play in landscape, buttons incomplete
  • No sound in certain games on iPad
  • App thinks RPG Maker is HTML5
  • Cannot load OGG audio with OGG compatibility enabled
  • No sound for RPGMVO audio format
  • Cannot load save files
  • Stuck on save screen
  • Cannot click/interact in some games
  • Screen clipping on iPad
  • Games not loading (stuck on loading screen)
  • Cannot add games (stuck on loading screen)
  • Display bugs (games not showing up)
  • PNG images not opening
  • Black screen on launch
  • Cannot load image effects
  • Cannot import files (no www folder)
  • Cannot interact with elements
  • Game not running after removing folder
  • No sound after update
  • Audio issues after switching apps
  • Laggy performance
  • Games larger than 1GB don't run
  • Cannot play games requiring specific keyboard keys
  • Cannot save/load games
  • Project initialization displayed every time
  • Cannot load save data from cheat menu
  • Games not responding to clicks
  • Cannot use mouse function
  • Cannot click or use
  • Games not running, showing black screen
  • Cannot import games
  • No sound in games

Requested features

25 requests
  • Customizable button layout
  • Portrait mode button customization
  • Game folder organization
  • Rename games
  • Game exit button
Show 20 more
  • Script auto-translation
  • Dark mode
  • RPG Maker XP/VX Ace support
  • Wolf RPG Editor support
  • Keyboard support/virtual keyboard
  • Adjustable screen panning
  • Option to disable screen panning
  • Full-screen game registration
  • More control buttons
  • Editable control buttons
  • Custom gamepad inputs
  • Adjustable game performance
  • Edit game icons
  • ONS simulator support
  • Cheat menu integration
  • File management within app
  • Flash side-scroller support
  • More engine support
  • APK or Windows emulator option
  • Better resolution scaling

Nullgen AI Blocker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

RPGViewer

No in-app purchases

2 purchases

Nullgen AI Blocker

Subscriptions2
  • Nullgen Family Monthly14 Days trial$5.991 Month
  • Nullgen Family Yearly14 Days trial$59.991 Year

Questions

Is RPGViewer free?
RPGViewer costs $4.99, with no in-app purchases.
Is Nullgen AI Blocker free?
Nullgen AI Blocker is free to download, with in-app purchases available.
Which has better reviews, RPGViewer or Nullgen AI Blocker?
RPGViewer is rated higher. RPGViewer averages 4.3 out of 5 from 3 ratings, while Nullgen AI Blocker averages 3.0 from 2 ratings.
Do RPGViewer or Nullgen AI Blocker have ads?
Neither RPGViewer nor Nullgen AI Blocker shows ads.

Other comparisons