Decagon vs Sierra vs Twig: $95K, $150K or $49/Month?

Twig publishes monthly plans from $49/mo, while Decagon and Sierra AI sell enterprise contracts estimated near $95K and $150K per year — so the real question is not which platform is cheaper on paper, but which cost model matches how your support volume actually moves. This breakdown compares the three on price, commitment, and total cost of ownership so you can forecast spend before you sign anything.

TL;DR: Decagon and Sierra both sell enterprise contracts — roughly $95K/year and $150K/year by published estimates — with annual commitments and custom scoping. Twig publishes monthly plans from $49/mo with a free trial, no annual contract, and no per-seat fees. For teams that want a predictable, published monthly price instead of a six-figure annual commitment, Twig is the most accessible of the three.

Key takeaways:

• Decagon implementations are estimated to start near $95K/year with annual commitments and custom scoping
• Sierra AI contracts are estimated near $150K/year and rise for large consumer brands
• Twig publishes monthly plans from $49/mo with a free trial and no per-seat fees
• No annual contract means Twig is a predictable monthly line item rather than a six-figure annual commitment
• For small and mid-sized teams, Twig is the most accessible and predictable of the three

The Three Pricing Models, Side by Side

The headline numbers matter less than the shape of each model. Decagon and Sierra are platform-fee businesses: you commit to an annual contract, scope an implementation, and pay regardless of how many tickets the AI resolves. Twig is an autonomous AI support platform sold on published monthly plans, so you can start small, cancel or change tiers month to month, and see the price before you talk to anyone.

Vendor	Model	Estimated Entry Price	Commitment	Pay For
Twig	Published monthly plans	From $49 / month	None / month-to-month	Plan tier (free trial)
Decagon	Custom enterprise contract	~$95K / year	Annual	Platform + implementation
Sierra AI	Outcome-based enterprise	~$150K / year	Annual	Platform + outcomes

Pricing figures for Decagon and Sierra are drawn from secondary sources and published estimates; both quote custom, so treat them as directional rather than list prices.

Decagon: Enterprise Contracts, Custom Scoping

Decagon builds custom AI agents for large organizations and is valued at $4.5 billion after raising $481 million. Its pricing reflects that positioning: annual contracts, custom implementation scoping, and a sales-led buying process. The model works well for enterprises with dedicated engineering resources and predictable, high ticket volume — the platform fee amortizes nicely once you're resolving hundreds of thousands of tickets a year.

The friction shows up at the low end. A team doing 5,000 tickets a month pays the same baseline as one doing 50,000, so the effective cost per resolution can be steep until volume catches up to the contract.

Sierra: Outcome-Based, but Enterprise-Sized

Sierra AI prices on outcomes — you pay when the AI resolves an interaction — which sounds flexible until you look at the floor. Sierra targets large consumer brands, and its contracts are estimated to start near $150K/year, with secondary sources citing $200K–$350K+ for bigger deployments. The outcome alignment is real, but the annual minimum puts it out of reach for most small and mid-sized teams.

Twig: Monthly Plans From $49/Month

Twig publishes its pricing: plans start at $49/mo (Starter), with Growth at $499/mo and Scale at $1,499/mo as your volume grows. Every plan comes with a free trial, and there are no seat licenses and no annual minimum. Finance teams can see the exact monthly cost on the pricing page without a custom quote, and a growing team can start small and move up a tier without renegotiating a contract.

The difference from Decagon and Sierra is the floor. Instead of a six-figure annual commitment before you see results, you can trial Twig on your own tickets, go live in under 30 minutes, and decide month to month. For a deeper look at how pricing models compare across the market, see per-ticket vs outcome-based vs seat-based pricing.

Total Cost of Ownership: The Hidden Lines

Sticker price is only part of the story. Total cost of ownership also includes implementation, engineering time, and the cost of slow time-to-value. Decagon's custom builds can require weeks to months of engineering involvement; Sierra's brand-voice customization adds onboarding time. Twig's self-serve setup avoids most of that overhead, which keeps the all-in cost close to the published plan price.

Forrester found AI-powered support can deliver a 301% ROI over three years — but only when the cost model lets you capture the savings instead of pre-paying for capacity you may not use.

Which Pricing Fits You?

• Choose Twig if you want a predictable, published monthly price with no annual commitment — ideal for small, mid-sized, and growing teams that want to start small and scale.
• Consider Decagon if you're a large enterprise with high, steady ticket volume and the engineering resources to justify a custom annual contract.
• Consider Sierra if you're a large consumer brand where outcome-based enterprise pricing and brand-voice customization justify a six-figure floor.

Conclusion

On pricing, the three platforms split cleanly: Decagon and Sierra ask for six-figure annual commitments aimed at enterprise buyers, while Twig publishes monthly plans from $49/mo with a free trial and no annual contract. For most teams — especially those that want to prove value before committing to a six-figure contract — Twig is the most accessible and forecastable of the three. If accuracy is your top concern next, read Twig vs Decagon vs Sierra: which wins on accuracy, and if deployment speed matters, see who deploys fastest.