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The Apple-side setup Rork cannot do for you before your first release
Rork Max automates the build, the certificates, and the submission. Your Apple account, contracts, and tax details are still yours to fill in. Here is the order that avoids dead time.
TestFlight External Testing or Phased Release: Where a Solo Developer's Time Actually Pays Off
When you ship a Rork-built app to other people, you can recruit external testers or let a phased release absorb the risk. Here is how I split my limited time between the two, based on where distribution actually stalls and which three areas still deserve pre-release checks.
Find the native edits expo prebuild will erase before you upgrade to SDK 57
Expo SDK 57 makes expo prebuild clear and regenerate ios and android by default. Here is how to audit your hand edits first, move them into config plugins, and why 57.0.9 matters for Reanimated apps.
Your lockfile's dev/prod split won't tell you which licenses your app must credit
A record of classifying every dependency in a production project to decide what belongs on an app's license screen, and where the copyleft findings and the actual shipped artifact turned out to disagree.
Four Countries, Not the World: Checking Which of My Six Apps the September 30 Deadline Actually Touches
Android developer verification goes live on September 30, 2026 in Brazil, Indonesia, Singapore, and Thailand. Here's how to decide from your own install data whether that date is urgent for you, and what actually blocks indie developers.
Switching to Signed URLs Killed My Image Cache — Decoupling expo-image Keys from the URL
Signed URLs rewrite their query string on every expiry, so a URL-keyed cache never hits. Here is how to derive a stable key and drive expo-image's writeToCacheAsync and readFromCacheAsync yourself, with measured results.
Measuring Hermes Bytecode Delta Updates: One Added Module Cost 29x More Than One Changed Line
I measured OTA delta sizes against a 2.4MB Hermes bytecode bundle. Changing one line cost 2,104 bytes; adding one module cost 61,197. The widely repeated advice about stable module IDs turned out to matter least.
The 429s Kept Coming After Recovery: Measuring Retry Jitter Across 2,000 Clients
My backend came back but the 429s did not stop. I rebuilt the scenario in a 2,000-client discrete simulator and measured what plain exponential backoff, delay caps, 10% jitter, and honoring Retry-After cost in seconds — then reran everything with server capacity that degrades under load.
Cutting MCP Tools Didn't Make Anything Lighter — 2,377 Bytes of Definitions vs 110,298 Bytes of Response
I wrote a minimal MCP server for a wallpaper catalog and measured the byte cost of tool definitions against the byte cost of responses. Here is which side actually matters, and the real reason to merge tools.
Deciding overlay text legibility at ingest time instead of on device — four metrics measured side by side
Moving the question of whether text stays readable over a wallpaper out of the device and into the content pipeline. Four candidate metrics measured across 240 images, including what downscaled judging actually computes.
A JSON File 19% Smaller That Ships Only 3% Smaller — Measuring Catalog Payloads Against gzip
Five payload formats measured on a 20,000-item wallpaper catalog. Key shortening saves just 3.2% after gzip, while a columnar layout cuts 26.8%. Real numbers for Brotli, paging, and JSON.parse time.
Exactly 20 Characters, Still Rejected: Putting Character Counting Behind One Boundary
Emoji and combining marks make your client and your server disagree about length. I measured four counting methods on Node v22 and found 75.6% of naive truncations split a grapheme and 36.1% produced replacement characters over UTF-8. Here is the shared-module design that fixed it.