Fable’s intuition for iOS development is significantly worse than other areas I’ve used it in.
Great at infra, databases, web and more, just easily confused about how mobile apps work for some reason
2:25 PM · Jul 4, 2026 · 47.4K Views
T3 Stack creator Theo Browne says Fable excels at infrastructure but struggles with iOS mobile development
Research engineer YacineMTB agreed that Fable's mobile performance fails quickly
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Sentiment
Positive users highlight successful native iOS and macOS app builds with Fable plus its superiority to Opus, while negative users cite UI recognition failures and general limits in mobile development.
Pos
73.7%
Neg
26.3%
19 comments with sentiment.
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Theo - t3.gg@theo
Fwiw, Julius is usually more right than me
Julius@jullerino
The amount of world knowledge in Fable is insane. It’s navigating iOS simulators without any skills way better than codex with the OpenAI plugin 🤯
2hViews 5.6KLikes 17Bookmarks 5
REPLIES1
kache@yacineMTB
@theo Off the rails
Theo - t3.gg@theo
Fable’s intuition for iOS development is significantly worse than other areas I’ve used it in.
Great at infra, databases, web and more, just easily confused about how mobile apps work for some reason
4hViews 925Likes 6Bookmarks 0
Luke@ldo_dev
@theo fable's just an android developer, dw about it
5hViews 407Likes 9
Juan Carlos Maggi@TheJuanMaggi
@theo I'm personally starting to hate React Native, feels like anything that is truly interactive should stay the hell out of RN. Going to try Godot and see how that goes.
4hViews 27Bookmarks 1
evie@shakily
@theo this is true. ive tried it on swift ui and it gives me this 😂
5hViews 257Likes 6
Yami C ‣ Software Engineer@debugging_yami
@saaslanee @theo My experience is the exact opposite: several models worked well when doing RN and Expo work. I've had great success with Sonnet 4.6, Opus, GPT-5.3 Codex, and even Gemma 4. I only had issues when trying Haiku for RN work.
RN evals is handy when choosing https://rn-evals.vercel.app/
4hViews 10Bookmarks 1
Martijn van der Wal@martijn_vdwal
@theo I’ve had pretty good luck with it, it’s was able to make a great animation of a custom-ish input field
Just curious, are you using the MCP? I know you don’t like many MCP’s, but this one is really helpful for iOS dev, especially in the new beta
5hViews 301Likes 1
dat1madguy 🇺🇸@dat1madguy
@theo GPT5.5 has been excellent for me for mobile app development
5hViews 162Likes 1
Ab.@Abiodun0x
@theo @Chiebuniem_
5hViews 222
saaslane@saaslanee
@theo all models has been the same for mobile development specially react native and expo apps
5hViews 32
Gabriel de Andrade@GabrielElpidio
Mobile is hard for every model; it feels like it needs quiet. A bit of guidance overall, but I've had great results in cleaning up the code and making architectural decisions. Just needs more guidance
I feel like most of it is just a lack of better tooling; sim-serve goes a long way, but not nearly enough
5hViews 201Likes 2
Eliot Gevers@EliotGevers
@aatxcus @theo uhm, what? show me your projects then
2hViews 17
Krax@Kraxkrokat
@theo I'm actually having *really* good experiences with it. What type of app are you trying to develop?
5hViews 494Likes 1
henry@h14hdotcom
@theo I have yet to find model that can get RN Reanimated & GestureHandler right without heavy steering.
5hViews 414Likes 1
Eloy@GoodieFX
@theo Now who is right?
5hViews 307Likes 1
Erdal@ErdalToprak
@theo yeah overusing geometry reader and lacks coherence on macos apps
5hViews 304Likes 1
Destiny Franks@desphixs
@theo mobile has so many hidden rules that web dev just doesn’t prepare you for
5hViews 261Likes 1
Robertg761@Robertg761_
@theo I've had good success with it for Android app development so far
5hViews 641
Christian Ciabattoni@chrislciaba
@theo It’s weirdly good at gtm stuff though. So much better than opus/5.5
5hViews 520
Irfan@iirfan
@theo 5.5 is really good
5hViews 104Likes 1
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