Verdict
Tydlig replaces the standard calculator with an infinite canvas where you can see and edit past calculations inline, and reviewers consistently call it intuitive despite the unconventional design. It hasn't been updated in years and some users report freezes and crashes tied to older iOS versions.
Best for
Someone doing multi-step or recurring calculations who wants to see and tweak earlier steps instead of retyping them, like a freelancer sketching out pricing scenarios on an iPad.
Dealbreaker
Several reviewers report the app freezing or crashing outright, and it hasn't seen a real update in years, so bugs tied to older iOS versions may never get fixed.
The facts.
Pulled from the App Store, not written by hand.
Price
$1.99 once
In-app purchases
Unknown
Ads
Unknown
Platforms
iPhone, iPad
Rating
4.8★ (2,627)
Version
1.6
Last updated
Nov 28, 2017
Released
Dec 5, 2013
Attributes
Native appOne-time purchaseNo subscription
Category
Utilities, Productivity
What reviews consistently say.
Themes grouped from 200 App Store reviews. Source feed ›
Praised for
Ease of use and design23 reviews
Subscription pricing and paywalls3 reviews
Import and export3 reviews
Sync and multi-device3 reviews
Complained about
Crashes and stability3 reviews
Where this comes from
23 of 200 recent reviews raised: Ease of use and designApp Store reviews ›
3 of 200 recent reviews raised: Subscription pricing and paywallsApp Store reviews ›
3 of 200 recent reviews raised: Crashes and stabilityApp Store reviews ›
Listed at $1.99 once on the App StoreApp Store listing ›
Where we recommend it
Calculator apps you buy once ›Scientific and graphing calculators, bought once.
Alternatives with the same rule.
Every app here is a single purchase. None of them can start charging you monthly for what you already bought. Also with a catch.
$5.99 once · 4.6★ (12,032) · Updated Feb 26, 2026
Verdict. Reviewers are split on the interface: some find it easy and worth the one-time cost, others call it confusing and unlike a physical TI calculator. It works as a graphing calculator substitute but has a learning curve some never get past.
Best for. A student who needs graphing calculator functions on their phone and is willing to spend time learning a non-TI-style interface.
Dealbreaker. Several reviewers describe the UI as confusing or ugly and unlike a standard TI graphing calculator, so it may not be a smooth swap if you're used to that layout.
$5.99 once · 4.7★ (6,346) · Updated Mar 12, 2026
Verdict. A well-regarded scientific calculator with a clean design, but a recent interface overhaul has left a chunk of users frustrated, with some reporting keyboard input and trig functions broken on macOS.
Best for. iPad or Mac users who want an advanced scientific/graphing calculator and don't mind relearning the interface after updates.
Dealbreaker. Several reviewers say a recent update made the interface awkward, and some report it's effectively unusable on macOS due to keyboard input problems.