Stratus vs Polyend Endless: Two $299 AI Pedals With Very Different Ideas

Last updated August 31, 2026. Specs for both pedals come from each manufacturer's published materials; sources are linked at the end.

Two pedals, both $299, both built around the same promise: type a description of the sound in your head and get a playable effect back. The Polyend Endless won Best in Show at NAMM 2026 for it. Our Stratus does it too, and it is the number one reason people tell us they bought one. So it is a fair question: if you have $299 and you want an AI-powered pedal, which one?

The honest answer is that they are built for different jobs. Endless is a single-effect stompbox that you can reinvent whenever you want. Stratus is a full rig in a pedal: a chain of effects, a neural amp model, a looper, a tuner, and 14 presets you can switch on the floor. Here is the detail.

The short version

• Endless runs one effect at a time in stereo, has an expression jack and a headphone-capable output, and charges per AI generation using tokens ($20 worth included with a new pedal).
• Stratus runs a whole chain at once, includes native Neural Amp Modeler support with 300,000+ free captures on TONE3000, and gives every owner 30 free AI builds every month.
• If you want one boutique-style pedal that can become a different pedal for every song, Endless is a strong pick. If you want one box that replaces the pedalboard and the amp, that is Stratus.

Side by side

How the AI actually works

This is the biggest difference, and it is easy to miss from the outside because both products say "describe an effect."

Chaos Audio AI FX Builder. You describe the effect in the Chaos Audio app or at build.chaosaudio.com, and the builder writes brand-new DSP code for that prompt in FAUST, a programming language purpose-built for real-time audio. It is not picking from a menu of pre-made effects: the code is generated from scratch, then run through multiple rounds of compilation checks, automated code review, and audio-output testing before it lands in your library wirelessly. About 95% of builds deliver a working effect. Every generated effect gets up to 10 knobs and 3 switches, and Advanced Mode lets you read and edit the FAUST source of anything it made. Effects are yours to keep and also run on our Nimbus amp. Every Chaos Audio account gets 30 free builds a month, resetting automatically, with no subscription; a generation and a revision each cost one build, and paid plans add more for heavy users.

Polyend Playground (beta). Registered Endless owners log in to a browser-based tool, describe what they want, and get back a patch a few minutes later. Polyend's FAQ describes Playground as an AI layer over a library of DSP algorithms the company has developed over the years: the AI interprets your prompt, then combines or adapts those building blocks into a new patch and tests it before delivery. Generations cost tokens: a simple delay runs around $1–2, a complex granular looper can cost up to $5, and each further iteration on a prompt spends more. You own what you make and can share it free or sell it.

Two practical differences follow. First, scope: because the FX Builder writes new code rather than assembling from a fixed set of building blocks, it is not bounded by a catalog of past work; ask for something nobody has made before and it can still write it. Playground's generations are built from Polyend's algorithm library, which is deep but finite by design. Second, iteration: on Stratus you can revise a prompt ten times in an afternoon without thinking about it, while on Endless each iteration has a dollar figure attached, which is a reasonable way to fund cloud costs but changes how freely you experiment.

One effect versus the whole chain

Endless is designed to run one effect at a time, loaded over USB. Think of it as a deep, boutique single pedal whose identity you can swap. It slots into a board like any other stereo stompbox.

Stratus runs multiple effects simultaneously in a chain: compressor into drive into amp model into cabinet IR into delay into reverb, for example. The limit is processing power rather than a fixed slot count. A NAM A2 amp block uses roughly half the CPU on its own and a 1024-sample IR about a fifth, so a chain with both plus a couple of heavy reverbs will get close to the ceiling. The usual workaround is a full-rig capture that already includes the cabinet, which frees up the IR block. Lighter chains of drives, modulation, and delays leave plenty of headroom.

Amp modeling

Stratus runs Neural Amp Modeler natively using the A2-Lite architecture, with no conversion to a proprietary format. That matters because NAM is the open capture standard, and TONE3000 gives you over 300,000 free amp, pedal, and cab captures (more than 500,000 files including IRs) that you can browse and download to the pedal from inside the app. You can also capture your own amp for free. A2 was built by TONE3000 together with NAM creator Steve Atkinson so that affordable embedded hardware could run captures on-device, and A2-Lite is the size designed for pedals and amps.

How good is it? TONE3000 published its testing when A2 launched: a quantitative comparison across 39 tones using four error metrics, and a MUSHRA blind listening test in which more than 1,000 participants submitted over 100,000 ratings. In both, A2 outperformed Neural DSP's Neural Capture V2, IK Multimedia's ToneX, and Line 6's Proxy, and TONE3000 states that A2-Lite delivers better sound quality than Quad Cortex while running at 50% CPU on a $3 ARM chip. The test code and raw ratings are open source on GitHub. The point for Stratus buyers: the amp modeling in this $299 pedal is the same open architecture that outscored the big-name capture formats, in the size built for pedals.

Endless does not list a capture format. Amp-style sounds are available as individual effects in Polyend's library or through Playground, but there is no equivalent of loading a community capture of a specific amp.

On stage

Stratus has two footswitches: the silver one and the black Multiknob, which clicks under your foot. In Preset Mode the knob steps through seven color-coded pairs of presets on the LED strip (blue, green, yellow, orange, red, purple, pink), and the silver footswitch flips between the two presets in each pair, shown bright and dim. That is 14 full effect chains you can reach without a phone. The pedal stores 128 presets, and a MIDI controller (over USB, with a USB host) reaches all of them by Program Change, plus CC control for master volume, bypassing or toggling individual effects by chain position, looper transport, and mode switching including the tuner. The looper gives you five minutes with unlimited overdubs, and holding both switches for two seconds brings up a chromatic tuner.

Endless gives you two footswitches and three knobs that map to whatever parameters the loaded effect exposes, so a well-designed patch can feel like a purpose-built pedal. Its TRS expression input is a real advantage for wahs, volume swells, and morphing parameters in real time; on Stratus, expression currently comes in as a MIDI volume CC through a controller.

I/O, build, and power

This is where Endless has the cleaner spec sheet. It is stereo in and out, the output doubles as a headphone jack, and it accepts 9V power of either polarity at 200 mA. Stratus is mono in and mono out with no headphone jack, so silent practice means going through an interface or a headphone amp. Stratus adds Bluetooth control from the app, can run on USB-C power, and comes in lighter at 11.6 oz against Endless's 0.88 lb. Footprints are similar: Endless is a bit wider and shallower, Stratus a bit longer and narrower.

Both are aluminum. Endless has a custom-machined enclosure with magnetic, swappable front plates, which is a genuinely fun idea. Stratus has an aircraft-grade aluminum enclosure that we once sent to 108,000 feet on a weather balloon; it came back working, and we gave it away.

What it costs to keep making sounds

Stratus ships with 19 effects, the 22-effect premium bundle is $99 (or $14.90 each), third-party developers sell plugins through the Tone Shop, community presets are free on Chaos Cloud, and firmware and app updates are free for life. The 30 monthly AI builds are included with the hardware.

Endless ships with 2,000 Playground tokens ($20), community patches are free to download, and coding your own effects with the SDK costs nothing. Playground generations beyond the included tokens are pay-as-you-go, and used units do not come with free tokens.

Openness

Both companies deserve credit here. Polyend publishes a C++ SDK with examples on GitHub, so programmers can build effects for Endless directly. Stratus effects are written in FAUST, Advanced Mode exposes the code the AI writes, and developers can publish their own plugins on the Tone Shop and keep 75% of sales. Chaos Audio plugins also run on the Nimbus amp, and desktop VST/AU versions are available, with the caveat that DAW support is still limited.

Which one should you buy?

Buy Endless if you already have a board and an amp you love, you run stereo, you want an expression pedal wired in, and what you are after is one endlessly reconfigurable boutique pedal. The magnetic faceplates and the open SDK are icing.

Buy Stratus if you want the AI generator plus everything around it: a chain of effects, real amp captures through NAM and TONE3000, a looper, a tuner, floor-switchable presets, MIDI, and no per-effect cost while you experiment. It is the pick for fly rigs, direct-to-FRFR setups, and anyone replacing a board rather than adding to one.

Sources

• Polyend Endless product page, tech specs, and FAQ
• Guitar World: Polyend releases Endless (NAMM 2026)
• TONE3000: Introducing Neural Amp Modeler Architecture 2 (A2), including quantitative and blind listening test results
• Chaos Audio Stratus product page
• Chaos Audio Stratus MIDI implementation chart

Stratus is $299 with free US shipping and a 30-day return window.