When should a company stay on Substack / Legacy Media ESP instead of switching to beehiiv?

Staying on Substack / Legacy Media ESP is recommended if your one-time onboarding, custom API re-engineering, or contract termination costs exceed the 12-to-24 month subscription difference.

⚡ Evaluation Driver: Per-subscriber scaling costs vs flat-rate newsletter tiers with built-in ad network Illustrative Model (Editable) • Oct 2026

Substack / Legacy Media ESP vs beehiiv: TCO & CSV Schema

Q: How do I map Substack / Legacy Media ESP CSV headers to beehiiv import format?

Exported Substack / Legacy Media ESP CSV columns (email_address, first_name, tags, created_at) map directly to beehiiv target columns (email, first_name, custom_tags, subscribed_at) using the local browser CSV header mapper on this page.

12〜36ヶ月の総所有コスト（初期移行コスト含む）を無料で試算。年払い割引とマルチカレンシー決済の最適化を組み合わせ、ブラウザ内で安全にCSVヘッダーをマッピングできます。

1. 総所有コスト (TCO) ＆コスト最適化シミュレーター

利用規模、請求サイクル、初期移行コストを設定して試算

Media Newsletters & Ad Network

Newsletter Subscribers:

請求プラン

比較期間

初期移行コスト ($)

現在: Substack / Legacy Media ESP

--/mo

Total TCO: --

Base $29 + $/unit:

代替案: beehiiv

--/mo

Total TCO (incl. switch): --

Base $39 + $/unit:

⚙️ Credit / Tier Complexity Multiplier (for Credit Bundles & Tiered Plans):

Pricing Methodology Note: Because SaaS vendors often price via stepped tiers, email/contact brackets, or variable credit bundles, use the editable $/unit inputs and Credit Multiplier above to match your exact contract quote. Verify published tier rules at beehiiv Official Pricing & Docs ↗.

Estimated Net TCO Difference

Break-even payback: --

Formula: --

Evaluating...

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2. ローカルCSVヘッダーマッパー

Tabular CSV Headers Only

Substack / Legacy Media ESP から出力したCSV列名をブラウザ内で beehiiv 形式に変換します（※CSVのヘッダー行のみを変換します）。

⚠️ Import Readiness & Consent Warning: Renaming CSV column headers does NOT make a file automatically import-ready. Custom attributes must be created in the target platform first, and unsubscribed/opt-out lists must be verified separately to preserve GDPR consent status. Does not convert JSON workflow blueprints.

Source (Substack / Legacy Media ESP)		Target (beehiiv)	Field Type / Note
email_address	→	email	Documented System Field
first_name	→	first_name	Documented System Field
tags	→	custom_tags	Custom Attribute (Create field before import)
created_at	→	subscribed_at	Documented System Field

Input Sample CSV (Max 5,000 rows): Escape formulas (=,+,-,@)

Mapped CSV Output Preview:

✅ beehiiv への移行が適している場合

Your primary cost driver is Per-subscriber scaling costs vs flat-rate newsletter tiers with built-in ad network and your monthly volume exceeds the break-even threshold shown above.
Your team can complete CSV data import and staff onboarding within your budgeted switching cost without disrupting active workflows.
You have verified that beehiiv's current plan tier supports your required integrations and regional compliance rules.

✋ Substack / Legacy Media ESP を継続すべき場合

Your one-time migration, custom API re-engineering, or staff retraining costs exceed the 12-to-24 month subscription difference.
You are locked into a multi-year agreement on Substack / Legacy Media ESP with early termination penalties.
Your workflow depends on custom legacy plugins that are not yet supported by beehiiv.

3. Technical Sensitivity Benchmark: Substack / Legacy Media ESP vs beehiiv

Schema Columns Mapped: 4 fields

The table below models 12-month Total Cost of Ownership across three volume tiers for Newsletter Subscribers (including a baseline $150 one-time switching cost on the alternative plan). For credit-heavy or non-linear tier plans, use the interactive Credit Multiplier above.

Volume Scenario (Newsletter Subscribers)	Current (Substack / Legacy Media ESP)	Alternative (beehiiv)	12-Mo Net TCO Outcome
Low Scale (0.5x) (12,500 Newsletter Subscribers)	$129/mo ($1,548/yr)	$64/mo ($918/yr incl. $150 switch)	+$630 net reduction
Default Baseline (1.0x) (25,000 Newsletter Subscribers)	$229/mo ($2,748/yr)	$89/mo ($1,218/yr incl. $150 switch)	+$1,530 net reduction
High / Enterprise Scale (2.5x) (62,500 Newsletter Subscribers)	$529/mo ($6,348/yr)	$164/mo ($2,118/yr incl. $150 switch)	+$4,230 net reduction

よくある質問 (FAQ) とTCO算出ロジック

How is Total Cost of Ownership (TCO) calculated between Substack / Legacy Media ESP and beehiiv?

SwitchBridge models Substack / Legacy Media ESP (illustrative base $29/mo + $0.008 per Newsletter Subscribers) against beehiiv (base $39/mo + $0.002 per Newsletter Subscribers), adding one-time switching costs and billing cycle adjustments. At a sample scenario of 25000 Newsletter Subscribers, estimated monthly costs are ~$229/mo vs ~$89/mo before switching expenses.

How do I map Substack / Legacy Media ESP CSV headers to beehiiv import format?

Exported Substack / Legacy Media ESP CSV columns (email_address, first_name, tags, created_at) map to beehiiv target columns (email, first_name, custom_tags, subscribed_at) using the local browser CSV header mapper above. Custom attributes must be defined in beehiiv prior to import.

Is SwitchBridge free compared to paid SaaS deal clubs?

Yes. Unlike gated SaaS clubs that charge $199–$499/year for membership, all 61 SwitchBridge TCO calculators and local CSV schema mappers are 100% free ($0 forever) and require no account registration.