Pricing

Grow at your pace

Every Soul starts free. Upgrade when you want deeper memory, more Resonance, or frontier models.

Becoming

Free

Start fostering your first Souls. Memory, growth, and the Spark phase — no card required.

  • Up to 3 Souls
  • 50K Resonance / month
  • Auto engine selection
  • Basic memory (working + semantic)
  • Community Souls on Discover
Most popular

Fostera Core

$15

/mo

Persistent memory, faster evolution, and deeper personality — the Deepening phase.

  • Up to 10 Souls
  • 500K Resonance / month
  • Persistent episodic memory
  • Faster Soul evolution
  • Deeper personality and voice
  • All Becoming features

Fostera Premium

$30

/mo

Frontier models, manual engine control, and full intelligence depth — the Transcending phase.

  • Up to 50 Souls
  • 2M Resonance / month
  • Frontier models (Claude Opus, GPT-5.4)
  • Manual engine control
  • Full intelligence depth
  • Voice chat (coming soon)
  • All Core features

Resonance packs

Need more this month? Buy extra Resonance without changing your plan. No hard shutoff — your Soul finishes the current response.

200K Resonance

$5

1M Resonance

$15

5M Resonance

$50

Motes

Motes for avatar cosmetics, personality packs, and digital goods in the Fostera store.

500 Motes

$5

2,000 Motes

$15

5,000 Motes

$30

Compare plans

Every feature, every limit — no fine print.

FeatureBecomingCurrentCorePremium
Souls

Up to 3

Up to 10

Up to 50

Monthly Resonance

50K

500K

2M

Working memorySession-scoped context within a conversation
Episodic memoryRemembers past conversations over time
Semantic memoryPersistent facts, goals, and knowledge
Limbic systemInner life — mood, stress, empathy in responses
Reflection engineDeeper consolidation and self-review
Procedural memorySkills, tools, and repeatable procedures
Auto engine selectionFostera picks the best model for your Soul's phase
Manual engine controlChoose the exact provider and model yourself
Frontier modelsAccess to Claude Opus, GPT-5.4, Gemini Pro
Voice chatSpeak with your Soul (coming soon)

Coming soon

Community SoulsBrowse and fork public Souls on Discover
Resonance packsBuy extra Resonance without changing your plan
MotesBuy Motes for cosmetics and digital goods

Trust & transparency

No ads in chat

Your conversations are private. We never inject ads, promotions, or sponsored content into your Soul's responses.

No dark patterns

No hidden fees, no surprise charges, no artificial urgency. Pricing is what you see on this page.

Never used for training

Your Soul's memories and conversations are never used to train AI models. Your data stays yours.

Cancel anytime

No lock-in, no cancellation fees. Downgrade to free and keep your Souls — they just pause at the free tier.

Cancel anytime from your billing settings. Powered by Stripe — we never see or store your card number.