Spectra One
Brainstorm Force's full-site-editing block theme. Pairs with Spectra blocks for a builder-grade FSE workflow.
- Lighthouse
- 97 / 100 Tested June 1, 2026
- Accessibility
- WCAG AA
- Last release
- May 18, 2026 v1.4.2
- WP.org rating
- 4.8
Spectra One is Brainstorm Force's free full-site-editing (FSE) block theme, designed to pair with Spectra (their block library plugin). Released in 2023 as Brainstorm Force's bet on the FSE future, separate from Astra's classic-theme heritage. Modern Gutenberg-first design with strong default typography and pattern coverage.
Pros
- Genuine FSE block theme, not a classic theme with block features bolted on
- Strong default typography and pattern library
- Free, no upsell paywall
- Maintained by the same team behind Astra (active vendor, real engineering investment)
Cons
- Smaller install base than Astra (more recent launch)
- Best paired with the Spectra blocks plugin for full pattern coverage; some features are split between the two
Pick Spectra One when you want to commit to the FSE workflow, you value performance, and you appreciate that Brainstorm Force is a sustainable vendor.
Avoid if you specifically need a classic theme with header/footer builder controls in the WordPress Customizer (look at Astra instead, from the same vendor).
Frequently asked questions
- Is Spectra One free?
- Yes. Brainstorm Force publishes Spectra One as a fully-free FSE block theme. The vendor's commercial revenue comes from Astra Pro, Cartflows, and other products in their portfolio.
- Do I need the Spectra plugin to use Spectra One?
- Recommended but not required. Spectra One works as a standalone FSE block theme; pairing it with the Spectra block library plugin unlocks the full pattern coverage the theme was designed against.
- Spectra One vs Twenty Twenty-Five?
- Twenty Twenty-Five is more minimal and shipped by WordPress core. Spectra One has richer default patterns and a clearer design aesthetic. Both are FSE block themes; pick Twenty Twenty-Five for a blank canvas, Spectra One for a richer starting point.
- Who makes Spectra One?
- Brainstorm Force, the India-based WordPress products company that also publishes Astra (the most-installed premium theme), Spectra blocks, and Cartflows. Active vendor with consistent release cadence.
Recent releases
- v1.4.2 May 18, 2026
Block pattern refinements, accessibility audit
- v1.4.1 April 2, 2026
Patch release for query loop layout
- v1.4.0 February 25, 2026
New starter site patterns, color palette updates
- v1.3.5 January 8, 2026
Maintenance release
- v1.3.4 November 10, 2025
WordPress 6.8 compatibility
| Product | Type | Price | Lighthouse |
|---|---|---|---|
| | Block | Free | 97 |
| | Block | Free | 99 |
| | Block | Free | 99 |
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Performance testing
Tested on Kinsta Starter (Google Cloud C3D, Iowa). Configuration: Spectra One default settings, single landing page, mobile, 4G simulated, cold cache. 5 runs, median reported. Raw Lighthouse JSON downloadable on request.
Data freshness
Last release tracked May 18, 2026. Release history maintained from the vendor's changelog. Vendor activity refreshed on every build.