Local-First Software: Taking Back Control of Our Data

Core Message

Cloud software made us renters of our own data. Local-first software reverses this: data lives on your device first, syncs through servers optionally, and survives even when the developer disappears. CRDTs make this possible by merging concurrent edits automatically.

Key Takeaways

The spark came from frustration - Adam Wiggins recalls music stopping mid-tunnel because the streaming app required a server connection. "Where did my playlist go? Why have we done this to ourselves?"
CRDTs dissolved the ownership-collaboration tradeoff - Martin Kleppmann discovered conflict-free replicated data types through an algorithms paper and realized they could give "power back to users again."
The name crystallized a movement - What started as "serverless software" became "local-first" in 2019 when Ink & Switch published the foundational essay. The name gave scattered efforts a rallying point.
Production apps prove the model - Figma and Linear dominate their categories precisely because local-first architecture delivers instant responsiveness. They invested millions building custom sync engines—frameworks like Jazz now democratize access.
Servers become supporting cast - Local-first doesn't mean serverless. Cloud infrastructure handles backup, discovery, and bridging between devices. The shift: servers support rather than own.
End-to-end encryption becomes natural - When data lives locally and servers only sync encrypted blobs, privacy stops being a feature layered on top and becomes intrinsic to the architecture.

Visual Model

graph LR
    subgraph Cloud-First["Cloud-First (Traditional)"]
        U1[User Device] -->|request| S[Server
Source of Truth]
        S -->|response| U1
        U2[User Device] -->|request| S
    end

    subgraph Local-First["Local-First"]
        D1[Device 1
Full Copy] <-->|CRDT sync| Relay[Optional
Sync Relay]
        D2[Device 2
Full Copy] <-->|CRDT sync| Relay
        D1 <-.->|P2P| D2
    end

Notable Quotes

"I was listening to music from station to station. It would go into tunnels where there was no cell service. And the music I was listening to stopped and the playlist disappeared. I thought, where did it go?" — Adam Wiggins

"Your software should be instantaneously responsive to you all the time." — Martin Kleppmann

"It's your data now and forever."

Featured Voices

The documentary interviews key figures from the local-first movement:

Martin Kleppmann - Associate professor at Cambridge, co-author of the foundational local-first essay
Adam Wiggins - Founder of Heroku, Ink & Switch, and Muse
Peter van Hardenberg - Lab director at Ink & Switch
Ray McKenzie - Product manager at Ditto (sync engine company)

Connections

local-first-software - The foundational Ink & Switch essay that this documentary visualizes and contextualizes through interviews with its authors
the-past-present-and-future-of-local-first - Martin Kleppmann's conference talk expanding on the definition and future vision discussed in this documentary
a-gentle-introduction-to-crdts - Technical deep-dive into the CRDT technology that makes local-first collaboration possible