Notes on testing
mobile apps.

Latest

You can now ask Semaloop about your app

Type a question in your own words, and Semaloop reads every run on every build to answer it.

Charlie·Co-founder & CEO·Oct 22

Never twice... but maybe never

Using a model checker to prove our Slack build summary is never posted twice, and finding the case where it's never posted at all.

Sam·Founding Engineer·Oct 9

Loops need verifiers

An agent is no good in a loop if it doesn't have an accurate verifier, and on mobile that verifier has been missing.

Rory·Co-founder & CTO·Oct 5

Our shiny videos are React components

Making launch videos with Remotion, a brand kit and Claude Code, and the one frame we couldn't escape.

Sam·Founding Engineer·Oct 2

Now on Android: why we got iOS right first

Semaloop now tests Android apps. Here's why we started with iOS, and why the same agents carried straight over.

Charlie·Co-founder & CEO·Sep 30

Is there a glass ceiling in agentic mobile development?

Last week in London, we sat down with Harry Davies to discuss this deceptively simple question.

Dani·Chief of Staff·Sep 22

Why we don't trust the accessibility tree

Most agents read the accessibility tree. We work from pixels only, and we think the trade is worth it.

Charlie·Co-founder & CEO·Sep 16

Docs that screenshot themselves

Making screenshots a build artefact, not a file someone forgot to update.

Sam·Founding Engineer·Sep 4

How Semaloop works with your existing tests

Whether we replace your Maestro suite is the wrong question. Where scripts, agents and people each earn their place.

Charlie·Co-founder & CEO·Sep 3

Why Claude isn't enough to test your app

A coding agent verifies the change it just made. A suite verifies everything it didn't touch.

Charlie·Co-founder & CEO·Aug 31

Best AI mobile testing platforms in 2026

An honest guide to choosing the right tool for your team, workflow, and budget.

Charlie·Co-founder & CEO·Aug 13

How to catch mobile bugs before they reach production

What slips through the gap between simulation and reality.

Charlie·Co-founder & CEO·Aug 9

Deciding what to do is the easy part

How agents turn intent into reliable real-world interactions.

Charlie·Co-founder & CEO·Aug 2

The review moved to the device

Why reading diffs stops catching what matters once agents write the code, and where verification goes instead.

Charlie·Co-founder & CEO·Jul 15

How to write a great test

A good test only fails for a useful reason. Three principles for writing tests that survive a redesign.

Charlie·Co-founder & CEO·Jun 19

Sizing up your test suite

Alternatively: what would win in a fight – one big test, or 100 tiny tests?

Sam·Founding Engineer·Jun 16

Is moving fast more important than shipping quality code?

We put two experienced engineering leaders in a room and asked them to settle on a very important question.

Dani·Chief of Staff·May 28

One month at Semaloop

Here's to adding more brilliant humans, more laughter and more building. Dani's perspective on her first month.

Dani·Chief of Staff·Apr 8

Sema-who? Semaloop

How we think about things, how we work, and what it actually feels like to be here.

Dani·Chief of Staff·Mar 31

Week one at Semaloop

A run through of a (first) week in the life of Sam, one of our Founding Engineers.

Sam·Founding Engineer·Mar 30

Finding the Nano Banana

How we used image generation models to smuggle coordinates and achieve 98% pointing accuracy on mobile screens.

Rory·Co-founder & CTO·Nov 12, 2025

When tests start drawing the map

Why traditional test suites break down as apps evolve, and what testing looks like when agents behave like real users.

Charlie·Co-founder & CEO·Oct 22, 2025
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