AllApps
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Apps nobody maintains any more.

Units Plus Converter is the top pick for anyone who wants a plain, ad-free unit converter and never wants to see a subscription prompt again. It hasn't changed in years, but a keypad converter doesn't need to change. Everything else here is a similar bet: old software that still does its one job, if you accept it will never be fixed again.

The filter. Every app here is still for sale, still well reviewed, and has gone at least three years without an update. That is not automatically bad — some software is simply finished — but you should know before you pay.
Top pick

Units Plus Converter

Alan Mrvica
View on the App Store ›
$19.99 once4.9★ (8,414)Updated Nov 19, 2018
Verdict
Reviewers consistently call this unit converter simple and reliable, with no complaints about ads or clutter. It's a narrow, single-purpose tool that seems to have reached a finished state rather than one still being iterated on.
Best for
Someone who needs a fast, no-frills unit converter on iPhone and doesn't care whether it ever gets new features again.
Native appOne-time purchaseNo subscription

Sleep Machine

SleepSoft LLC
View on the App Store ›
$3.99 once4.7★ (3,000)Updated Feb 14, 2021
Verdict
A no-frills white noise app with a wide sound library and simple controls, praised for smooth looping and easy customization. A small number of reviewers report crashes or trouble opening it, which is worth noting given how few complaints exist overall.
Best for
Someone who wants to mix and layer ambient sounds for sleep without dealing with a subscription or a cluttered interface.
The catch
A handful of users report the app crashing or failing to open, so it's not flawless on stability.
One-time purchaseLayered mixesNo subscription

Sleep Sounds: relaxing sounds

Anna Koynova
View on the App Store ›
$2.99 once4.7★ (1,968)Updated Jan 26, 2021
Verdict
Reviewers praise the sound quality and simple interface, and a few note it's easy on battery life overnight. The review set is thin beyond that, so it's hard to say much about edge cases or long-term reliability.
Best for
Someone who wants a straightforward, no-frills sleep sounds app with a clean set of nature recordings and doesn't need alarm features.
The catch
At least one reviewer wanted to use these sounds as a morning alarm and couldn't, so this isn't built for that use case.
One-time purchaseField recordingsLight on battery

PDF Reader Pro Edition®

iTECH DEVELOPMENT SYSTEMS INC.
View on the App Store ›
Free4.4★ (1,737)Updated Oct 23, 2026unverified
Verdict
Some users find it easy to read and annotate PDFs with, but a large share of recent reviews describe crashes, broken iCloud syncing, and trouble importing or saving files - problems that go beyond normal rough edges.
Best for
Someone who wants a simple PDF viewer for occasional reading and light markup, and who keeps files locally rather than relying on iCloud sync.
The catch
Frequent crashes, especially around saving, exporting, and scanning, plus reports that it doesn't work with iCloud files at all.
Native appOne-time purchaseNo subscription

Star Chart Infinite

ESCAPE VELOCITY LIMITED
View on the App Store ›
$4.99 once4.6★ (574)Updated Nov 17, 2015
Verdict
Star Chart Infinite gets consistent praise for its realistic night-sky visuals and simple interface, and reviewers repeatedly call it worth the money. It hasn't been updated in a long time, and some reviewers on newer iPhones report crashes and stuck screens.
Best for
Someone with an older iPad who wants a visually striking constellation map for casual stargazing without worrying about future subscription charges.
The catch
The app hasn't been updated in years, and a few reviewers on newer iPhones (like the iPhone 14) report it crashing or getting stuck.
Native appOne-time purchaseNo subscription

ArtStudio - Draw and Paint

Lucky Clan
View on the App Store ›
$4.99 once4.6★ (559)Updated Jan 18, 2019
Verdict
A capable drawing and painting app with a loyal following, but reviews describe frequent crashes and file corruption, especially when memory runs low or when importing/exporting photos.
Best for
Someone who wants a full-featured drawing app for casual projects like wallpapers or sketches and is willing to save often to avoid losing work to a crash.
The catch
Multiple reviews report crashes that corrupt or lose work, particularly during photo import/export or when the device runs low on memory.
Native appOne-time purchaseNo subscription

Who should skip this entirely.

If you need reliable cloud sync, work with files stored in iCloud or Google Drive, or plan to use your device for years and expect ongoing compatibility fixes, skip this whole category. These apps are frozen in time — no bug fixes, no adaptation to new iOS versions, no response if something breaks. Buy actively maintained alternatives instead, even if they cost a recurring fee, especially for anything involving document handling like PDF Reader Pro Edition, or anything you depend on nightly like a sleep app prone to launch crashes.

Questions.

Is it safe to buy an app that hasn't been updated in years?It can be, if the app does something simple and self-contained like unit conversion or playing pre-recorded sounds. It's riskier for anything touching cloud storage, newer hardware, or complex file handling, where lack of updates tends to show up as crashes.
Why would anyone still sell an app they don't maintain?Because it still works well enough for its core purpose and keeps earning downloads. Some of these are essentially 'finished' pieces of software — a converter or sound player doesn't need new features to keep functioning.
Will these apps keep working on future iOS versions?There's no guarantee. Nothing here has a track record of recent compatibility fixes, so an iOS update could break something with no promise of a patch.
Should I pick the cheapest option in this category?Not necessarily. Several of these apps have real, recurring complaints about crashes or data loss, and an unmaintained app won't fix those later. Price matters less here than whether the specific dealbreaker applies to your use case.

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