Engineering · 2026-08-12 · 1 min read
Why SLOW Tools Are Local-First
A practical approach to browser tools that stay fast, private, and inexpensive to run.
Start with the smallest useful architecture
Many developer utilities do not need a backend. JSON formatting, Base64 conversion, UUID generation, URL encoding, and image conversion can often happen directly in the browser.
Privacy is a product feature
When input can stay on the device, the tool does not need to upload it just to produce a result. That reduces infrastructure and makes the privacy story much easier to understand.
Performance and cost
Removing unnecessary API requests improves perceived speed and reduces recurring infrastructure work. The backend can then be reserved for features that genuinely need server-side processing.
A scalable path
Local-first does not mean backend-free forever. SLOW Tools can later add APIs, accounts, or premium capabilities without changing the basic experience of the simple tools.