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In the beginning God created the heavens and the earth.
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AdvancedVoices, narration and keys
In Google Cloud: enable the Cloud Text-to-Speech API and create an API key. In Netlify: Site configuration → Environment variables → GOOGLE_TTS_KEY = your key, then redeploy and paste your proxy URL here. Synthesized chapters are cached on this device. Neural2 voices are inexpensive; Studio voices are premium-priced.
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Recorded audio for the open translations, and for the walk stations, uses a Bible Brain key on the server (BIBLEBRAIN_KEY). A key pasted here stays on this device and is used when the server has none. Request one free at 4.dbt.io/api_key/request.
About WaymarkWhat a waymark is, and where everything comes from

A waymark is a sign set up along a road so travellers can find the way (“Set up waymarks for yourself”, Jeremiah 31:21). All 66 books and every chapter are pulled on demand and then cached on your device — chapters you've already opened stay readable offline, and the app itself loads without a connection.

Bible text → World English Bible via the HelloAO Free Use Bible API (bible.helloao.org, public domain, no key).
Cross-references → OpenBible relevance-scored set (Treasury of Scripture Knowledge, CC-BY) via the HelloAO API, loaded per chapter and filtered by the depth setting above.
Geography → Relief from AWS Terrain Tiles (open data); coast, rivers and lakes from Natural Earth (public domain). The kingdoms follow the year of the passage: Canaan and Egypt for the patriarchs and the exodus, Israel and the Philistines in the judges, then the united kingdom, Israel and Judah, Assyria, Babylon, Persia, the Greek kingdoms, Judea in the days of Jesus, and the Roman province after AD 70. The shapes come from historical-basemaps (A. Ourednik, CC BY-SA) where that snapshot matches the period, and are redrawn for the centuries that snapshot gets wrong. Over 350 places come from a built-in gazetteer at their traditional or best-attested sites, and some 750 more that the Bible names, from Theographic Bible Metadata with OpenBible.info coordinates (CC BY), each lit only in the verses that name it; eras and locations are approximate and scholarly estimates differ. Where a place’s name stands for a person (Cush the father of Nimrod, Judah the son of Jacob) the map stays still; which verses those are comes from Theographic Bible Metadata (R. Rouse, viz.bible, CC BY-SA).
3D walks → Every scene is modelled from scratch in the browser over the real terrain of its site. They are artistic reconstructions drawn from history and archaeology, not photographs of the past.
ESV is copyrighted by Crossway and used only via their API (non-commercial). Attribution shows under the reader in ESV mode.
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